It seems to hang on large projects especially.  For 
instance, I had one project called "Wood Burning 
Stoves and Water Heaters".  In it I had the following 
urls:

<http://www.hotpro.com>
<http://www.jademountain.com/>
<http://hearth.com>
<http://www.cetsolar.com>
<http://www.kni-co.com>

This project was started using an earlier version of 
HTTrack.  I also added the last 3 URLs to it under 
this version.  However, I'd even create new projects 
that it would hang on(I believe www.jademountain.com 
by itself would hang).  The bad part was there 
wouldn't be any error or log file to look at about 
what was causing the problem.